Knots to Feet per second Converter

Speed conversion · Updated 2026-10-04

Converting knots to feet per second is a multiplication by a fixed factor: 1 kn = 1.68781 ft/s. The table below covers the values people look up most often, and the formula section shows exactly where that factor comes from.

Because one knot works out to 1.68781 ft/s, the foot per second is the larger unit of the two: a figure given in foot per second always carries a larger number than the same measurement in knot. A chart drawn in kn can hide that, so check which label the axis uses before you compare two readings.

Driving and sport are the everyday sources of this pair: a dashboard reading in knots against a speed limit posted in feet per second, or a training plan written in one while a device reports the other.

The conversion factor used here is 1.68781 ft/s per knot (5 significant digits as shown). Kept to seven figures it covers professional measurement; if you round it to two or three decimals for a spreadsheet, the error scales with the input — at a value of 1,000 kn a factor rounded to three decimals can be off by a measurable amount. The reverse direction uses 0.5924838 kn per ft/s, the exact reciprocal, so a round trip through both pages returns your original number.

Knots to Feet per second formula

Use this formula to convert any knot value to feet per second:

Worked example: 100 kn × 1.68781 = 168.781 ft/s.

Knots to Feet per second conversion table

Knots (kn)	Feet per second (ft/s)
0.5 kn	0.8439049 ft/s
1 kn	1.68781 ft/s
2 kn	3.37562 ft/s
5 kn	8.439049 ft/s
10 kn	16.8781 ft/s
20 kn	33.7562 ft/s
50 kn	84.39049 ft/s
100 kn	168.781 ft/s
500 kn	843.9049 ft/s
1000 kn	1687.81 ft/s

How to convert knots to feet per second

Multiply the knot value by 1.68781 to get the equivalent in feet per second. This single factor works for every value in the table above and for anything else you need — there is no per-value adjustment, which is why a conversion table and a calculator always agree.

If you need the opposite direction, use the Feet per second to Knots converter instead of dividing by hand; both pages use the same source factors. For every other kn conversion in one place, see the kn conversion hub.

Frequently asked questions

How many feet per second are in 1 knot?
1 knot = 1.68781 ft/s.

What is 100 knots in feet per second?
100 kn = 168.781 ft/s.

Is converting knots to feet per second the same as feet per second to knots?
No — the direction changes the multiplier. The reverse conversion (1 ft/s = 0.5924838 kn) is on the Feet per second to Knots page.

Related conversions

Try the ConvBolt Unit Converter for any other speed unit, browse the Speed conversions, or read our conversion guides.